Remove legacy .gitignore files.

The removed local .gitignore files are no longer needed since we've
migrated to the platform2 gyp build.

BUG=None
TEST=None

Change-Id: I3c29f24df6156aa7bc0f575d5042a69b33bbed0d
Reviewed-on: https://chromium-review.googlesource.com/482064
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
4 files changed